Because of the size, weight and mechanical dials people might prefer Fuji over FF Sony cameras.
Although I tend to just shoot on auto-exposure and bracket 3 shots, 0EV, -2EV, +2EV. One of those will usually give me what I want, without any messing around with dials.
FF cameras are great, but a totally different thing.
I took a XT-3 with me to Tokyo. While it’s a nice camera, I still found it too bulky but without the benefits of FF.
I ended up going with a A7R3 combined with a RX100. I leave the hotel room with the former gets taken when I know there’s something important I want to capture, if it’s at night, or when I know bulk isn’t an issue. The latter is taken when bulk is of concern.